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<br />001015 <br /> <br />,'7::>, <br /> <br />Conclusions: <br /> <br />1. With the continuing high precipitation, particularly in late summer <br />and early fall of thi s year (150 to 200 percent of normal), <br />continuing and even increased activity at the toes or lower parts <br />of all four landslides is a high probability. <br /> <br />2. Investigations to date indicate that the major and upper portions <br />of the Meadow Mountain, Dowds I and Whiskey Creek slides are stable <br />at this time. <br /> <br />( <br /> <br />3. The immediate or sudden catastrophic failures of the entire old <br />slide masses are unlikely at this time but the highway and <br />"intermediate" slides at Meadow Mountain and the minor slide along <br />1-70 at Dowds and Whiskey Creek could well grow into slides of <br />major proportions. <br /> <br />4. Herculean measures to mitigate the effects of possible major <br />catastrophic slide movement such as tunnelling and constructing <br />conduits for river, highway and rail passage or major re-routing of <br />highways or railroads do not appear to be justified at this time. <br /> <br />Recommendations: <br /> <br />.. <br /> <br />1. Continued careful instrumental monitoring and field surveillance of <br />the slides should continue through two more spring and summer <br />seasons or at least one season after a return to normal <br />precipitation levels. <br /> <br />2. The emergency preparedness mechanisms which were set in place last <br />spring should be maintained. <br /> <br />3. The inclinometer hole #10 at Whiskey Creek should be redrilled and <br />one additional inclinometer hole should be drilled to monitor the <br />intermediate slide at Meadow Mountain. <br /> <br />4. Engineering laboratory tests should be performed on cores obtained <br />from the drilling program. <br /> <br />5. Stabilization measures such as surface drainage, dewatering or <br />buttressing should be devised for the highway and intermediate <br />slides at Meadow Mountain, the lower portion of the Dowds slides <br />and the toe slides at Whiskey Creek. <br />